Predicting Mission Life Performance And Reliability Of Rad-Hard Power Electronics

by Peter Lee, International Rectifier HiRel Products (IR HiRel), an Infineon Technologies company, San Jose, Calif. , How2Power Today, Jul 15 2021

Focus:
To achieve confidence in long-life, critical-mission space systems requires rigorous design, strict qualification and radiation testing, and controlled manufacturing and screening to eliminate manufacturing defects and infant failures. Providing performance validation over the life of the mission is addressed through extensive design analyses validated by empirical data. This article explains IR HiRel’s design analysis methodology for its rad-hard hermetic hybrid dc-dc converters that power spacecraft electrical subsystems. This method provides end-of-life verification of the dc-dc converter specifications and performance in accordance with MIL-PRF-38534 Class K. Topics discussed include the controlled manufacturing and screening process for flight models; the design flow from specification to production release; modeling and simulation of the converters; modeling to predict compliance with the relevant standards; converter level radiation testing; stress, thermal and worst case design analysis; and TOR compliance requirements, which go beyond MIL-PRF-38534 Class K.

What you’ll learn:

• How to provide end-of-life verification for rad-hard, hybrid dc-dc converters per MIL-PRF- 38534 Class K (overview)

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